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CVE-2021-24099— Skype for Business and Lync Denial of Service Vulnerability

Quick assessment

Affected
Microsoft Skype for Business Server 2019 CU2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Skype是美国微软（Microsoft）公司的一款通信应用程序。该程序可通过互联网为计算机和手机等移动设备提供与其他设备进行视频通话和语音通话的服务。 Microsoft Skype 中存在安全漏洞。以下产品和版本受到影响：Skype for Business Server 2019 CU2,Skype for Business Server 2015 CU 8,Microsoft Lync Server 2013。

CVSS 6.5 · Medium EPSS 3.20% · P88

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-24099

Vulnerability Information
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Vulnerability Title
Skype for Business and Lync Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Skype for Business and Lync Denial of Service Vulnerability
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Lync Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Skype是美国微软（Microsoft）公司的一款通信应用程序。该程序可通过互联网为计算机和手机等移动设备提供与其他设备进行视频通话和语音通话的服务。 Microsoft Skype 中存在安全漏洞。以下产品和版本受到影响：Skype for Business Server 2019 CU2,Skype for Business Server 2015 CU 8,Microsoft Lync Server 2013。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Skype for Business Server 2019 CU2 7.0.0 ~ publication cpe:2.3:a:microsoft:skype_for_business_server:2019:cu2:*:*:*:*:*:*
Microsoft Skype for Business Server 2015 CU 8 2015 CU 8 ~ publication cpe:2.3:a:microsoft:skype_for_business_server:2015:cu8:*:*:*:*:*:*
Microsoft Microsoft Lync Server 2013 0 ~ publication cpe:2.3:a:microsoft:lync_server:2013:*:*:*:*:*:*:*

II. Public POCs for CVE-2021-24099

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III. Intelligence Information for CVE-2021-24099

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Vendor Advisories for CVE-2021-24099 (1)

Same Patch Batch · Microsoft · 2021-02-25 · 58 CVEs total

CVE-2021-24094 9.8 CRITICAL Windows TCP/IP Remote Code Execution Vulnerability
CVE-2021-24078 9.8 CRITICAL Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-24077 9.8 CRITICAL Windows Fax Service Remote Code Execution Vulnerability
CVE-2021-24074 9.8 CRITICAL Windows TCP/IP Remote Code Execution Vulnerability
CVE-2021-24088 8.8 HIGH Windows Local Spooler Remote Code Execution Vulnerability
CVE-2021-24093 8.8 HIGH Windows Graphics Component Remote Code Execution Vulnerability
CVE-2021-24072 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-24066 8.8 HIGH Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2021-1728 8.8 HIGH System Center Operations Manager Elevation of Privilege Vulnerability
CVE-2020-17162 8.8 HIGH Microsoft Windows Security Feature Bypass Vulnerability
CVE-2021-24105 8.4 HIGH Package Managers Configurations Remote Code Execution Vulnerability
CVE-2021-24112 8.1 HIGH .NET Core Remote Code Execution Vulnerability
CVE-2021-1722 8.1 HIGH Windows Fax Service Remote Code Execution Vulnerability
CVE-2021-26701 8.1 HIGH .NET Core Remote Code Execution Vulnerability
CVE-2021-1726 8.0 HIGH Microsoft SharePoint Server Spoofing Vulnerability
CVE-2021-1733 7.8 HIGH Sysinternals PsExec Elevation of Privilege Vulnerability
CVE-2021-1732 7.8 HIGH Windows Win32k Elevation of Privilege Vulnerability
CVE-2021-24096 7.8 HIGH Windows Kernel Elevation of Privilege Vulnerability
CVE-2021-24081 7.8 HIGH Microsoft Windows Codecs Library Remote Code Execution Vulnerability
CVE-2021-26700 7.8 HIGH Visual Studio Code npm-script Extension Remote Code Execution Vulnerability

Showing top 20 of 58 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Skype for Business Server 2019 CU2
Same vendor: Microsoft

V. Comments for CVE-2021-24099

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